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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b2575895cb8771b03c810c886ec96005aba48df1ad19fce475f448b01b696b' 
  AND token = 'ud0j9SXrM995BmnZaO4onyJDO2Mo9x9GK7Erz/4WwDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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