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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028b0abd4b0d1c658c7bc5db7e337d871f0c6e3edea53e2e7e076bd3a32ab2a1' 
  AND token = 'hyGJDo7qBrbW0eeAKIJmVOXOmQdcaROlaVcZgir3BfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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