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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca997404d43625317592d4f56d7eff73102a72bc776eb11ffba36c669d1370c' 
  AND token = '5Sr2+wvoyvm/r3A8j8+D1LrnlmkeZNiijlFweLoHul4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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