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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0135345df786801a8742fc0d22365f75323c916512f02cc132550a80d9ccad' 
  AND token = 'Oewsh2c+FWpBvysXwC1wRXGVbS9WeCyRiKbAgK4Xx/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}