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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd745b2a9e5090384794b508a5e547017b34225223289c47ca355c0ccb0f4ff3b' 
  AND token = '2fgt3l7bcVa/sJsxtlkwQVPb4Y+y/7Ngezf6ACQb30g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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