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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0e51138437ddefc8b58a3eed01f6fb4ecc20c01ff4c49c3e7658b88d986ce1' 
  AND token = 'B3SwcYpGtvYyCyGjpWKI6Lyqo4v9MAy5VKXUP6JG0go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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