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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30054a6a403c2ab5457a326af8120e103f3730cae539aa451c5782240f298c67' 
  AND token = 'iF3pSvZ875FXCbCNXCyVkNK/y1HoAlyThrB8ymgRH1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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