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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa937fa3fb3470715541b9cdf1bc1295b0ce8a0fda7d1222e3ad9e30909dc5be' 
  AND token = 'grgIYTY26vlIU7Yte8RV/rMVfz9lDNXRq+uFqcJ3B0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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