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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b9dc844b2f03727ad960c15f4c359740600a02757ab560fd1a2caaecff62d1' 
  AND token = '9Tgjhjd8h7cGBCFJUeQUunjFOfM0yBcPaU6lGV+/4+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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