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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606b91283af922bfa36f4ee669c633e9058133d63c414fe0c951dd84f06a83de' 
  AND token = 'hpRhYCkL5Z75FqktGQXuf0YUPsZck9q/NLobwueJDW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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