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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98180270e489cacd695e68c7c74ffa6bd6496d2a63ee12d403a96002ae9a19e' 
  AND token = 'o5k37277Qjr2N6H10LdAoryyRkOwyLnjbqWT9v5aaW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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