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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1559a1422bb549070bb117453172c159b1c7bd6a9d2cc6a7d4fba123194c10e' 
  AND token = 'HmLKLJ15MnhoYblFVvRGvKUEZEt6UI2BTYzMykhC8Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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