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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47d44507637310e1272ff2b7d7a1e4d518107ac2e40fb970d9145aa460313f9' 
  AND token = 'jmCibOiSxP3ExqyBgMqjllIyC38RTvzAHSLExNTEDls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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