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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03d93e68f41e17d837f82199a92950d0db882679f6f04bd8f1be27601f752d5' 
  AND token = 'nXSKNTsL+MU6UzB0ekANJzxYom3smC7P9DeNtNm8RcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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