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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc4db88dd5b4280250ded939bf769a598c9f6a03abaa8c3e3a1c51000339bb2' 
  AND token = 'LrSes1Cv6XHxEYqsJ8dXz4kzzsmFcNkBzATCzBgz4xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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