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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3ec019b841b31c8950f2ff92bf8b62ed24388e90fb9ff1525c68108ab1828b' 
  AND token = 'nGBdWk+RWLzihplDmE2yzNxKop4Oh6Sm6i3Es8e3YZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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