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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06d6cf7e273926739c2ccc29d449b49aac0930c8cdae8f0ddbf3b92e6df9cdf' 
  AND token = 'LN5p52QCW5WKM/GRKMcY69FLxB0KchcNPZSBWZfdPWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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