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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e82f81d407ad6fc9a383d7af2f0179a2c87e16ba8fbb2cf9b519cd1d2981bd7' 
  AND token = 'WOIkMdIKWy2Ud143KMdYRBi/eqG3j2xCLXTP0o+5PZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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