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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4660b4be56b1d752ffdedb8a8a6770e7c8319358b1c2f52f356b48f7154a0b1d' 
  AND token = '37aYbVRbO63PJP6NgYBUecYP4E4HzKUk2GdtMJQcH/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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