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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfeadd26433671d23dade73c2a9b382f39221580d59eea26f558a6b811952dd' 
  AND token = 'EL4vP/3AHd6qAo/7HWwM41m9XZYqEGe5AaRfgrJjZ2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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