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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08665951077ac49088d44061c0061f56348ce2141073230697191a62329e91d5' 
  AND token = '59i+/NFDMcrNaYQQRrW/Ri5A+LLTJ4+YbKjUerqHohk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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