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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf6fc32b6a3f55845942f2326c7e6a56ade314564650d2fbcda6823d067062d' 
  AND token = 'aebl6dA7mR2vHesQi0sdBQ+bVor+bdkQCJGvb57lXjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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