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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358733001d5782fd620b6dc5097a8c536a249662be9616df2c5afc1cf92c4003' 
  AND token = 'jMbAQD5cRO8PwZPF08sq9Lqcf0uL+6o5MwPYYCepHy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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