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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac9a6c3e648ed2d39948115e072f5e45ae98b02f76005f33a50ff689c71b9a0' 
  AND token = 'Ufk2XXHxVMWJS5bTdVkP0WI9ssLpSL9sb/Cc6njFXrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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