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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d7373c307eb0b76708d4deffd2b4b2878e00891fa18a449e4176f078c079a6' 
  AND token = 'rRBUpSBhPhGv+ilSr6I4B2XOcQPqwuRIVpDCwflib98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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