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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954014c72879518b7701cbbc6bb730fd0b2b1778efee656bcb21edb71abd6fc0' 
  AND token = 'WC93GCo+dngdty4/q7EIuU1nEi6UGc8kvXA9cBMqFN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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