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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9c793042f79f47ae0d5662669707765b4b640082d75e4d87eea1b8fa095713' 
  AND token = '58hrA12sOEr7424PHkZsF5fJ0yEVSflO3RkMMcSi68o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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