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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b21f7cf6d8d122eedc9aad4619eb0bb0a758267f9d67d64ce87991ae5b9f00e' 
  AND token = 'e9RRBDePmAgv7y7viv3nM/2iarQOwx8oYaSDlHKnVmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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