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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8e97161f17b30b9242d2b85cc10db0ecd9f245b34fb37920433cc41773fc89' 
  AND token = '1PAzG2hlVLpfc+qA7jdUuV5tT1JkxihWecnFA4vB2YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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