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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b1ee7b2facfa83014fa9608fced80ed759f609ca4469b159e1567a8068b67c' 
  AND token = 'b4YX9F3aakKj/7+vlROgYR2NL+3q8i+DO65xsy1Hg4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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