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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f508034eeee1a05c24527318e796752571887b48f11a66148c5245dc1182a75' 
  AND token = '+hwcu6BQwULfP4WKJ8gm7AN+vLH1H2PplcaXn0he0ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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