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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0807ca6778818279331a68dca522c6009e8bfca8857c905d28eae5481a96a83e' 
  AND token = 'S47zceu82R1tlsFubzMIRUR+ITJoPHgLiymyK6fPiH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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