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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fdc35424cc242a34fe4b961682b2af590bdbf4cab7a54a8080b5b6d41509b0' 
  AND token = 'ZTqOvnFhjsaVldMAhVye0xhlES5v8WGRHc1Ms9o3v/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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