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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a793e873eec93afc00eab28e6eb3b4f982b5d1f923bdea0b406f814dda7b3bfa' 
  AND token = 'iC4M0uAKhC6RnAFXvQO1Gi2Tp2d1sBz98sEhsRUh8mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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