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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9777be5906a887fe1bfb6bb5fd53374f97ac76a406acea59c2ecf08d8b7d6ccb' 
  AND token = 'C1gJCOlViCSLCWNEbn2bGLzWofRDMJmgNX7/aGYk5Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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