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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e308ab8970d9fe36d4dfbcaaf2fe4c5ae3e1c3fbf51e57d6b939d62b0880a6' 
  AND token = 'N6RtnlORjuQJ3PsuAFm0R/Lnv491OGrcZ2M2DOn/J6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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