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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f7ba5f33642d9ccb293f5eb651a04b21f9f55c11fff39be068ed6853e02dda' 
  AND token = 'jAHerxDhF+vaX1qQFEI8Os358b/3IHo4/uneqmamrig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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