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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90c51e7748466965da6675af1944d28fb0720da46a026bc0c45ff8d9b8506de' 
  AND token = 'wTdyVds27V3SQ6FiK4fgfbjlxs0QuUQ2F3H2qpiQ4Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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