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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177306f0ebcd47841d35eaefc3847c96ffc4658cde7c9744f0085d76ff11c3b4' 
  AND token = '3GINWwo++gXi2RceJ79xXMmrNJ63Ik84tq9bYynhpco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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