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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c762d03608f12c5bcbaf508703910affc4e8c73683e4df87c33a2d2cce3b7e2' 
  AND token = '8Q5bCux9HhrZGMV4xKlLvFTCakcFv3glxF6wigdSW2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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